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Tektronix 7633 Scope, Can anyone please help Old64goat!!!

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David Hess:

--- Quote from: finom1 on May 03, 2017, 12:37:04 am ---Can someone please provide screen shots or pdf scans of what the old64goat is asking for?
--- End quote ---

The link casinada gave is the scan I use for the 7633 and has all of the schematics toward the back.  They are even in color; Tektronix liked to use blue ink.

http://exodus.poly.edu/~kurt/manuals/manuals/Tektronix/TEK%207633%20%20Service.pdf


--- Quote ---"Where is schematic 7?
--- End quote ---

PDF page 296.


--- Quote ---I can't find schematic 8, ALL fuses test good.
--- End quote ---

PDF page 300.


--- Quote ---What may help is a print out of all the schematics & voltage test points for this no HV problem.
--- End quote ---

I usually end up printing out selected schematics on 11x17 paper when working on a problem like this.

Electro Detective:
I learn something every time I watch an Old64goat video, be it his tech tips or flap.  :-+

He checked the heat/age failed glue ends 0.15 amp glass fuse with a meter and got 20 ohms reading = not good

I 'may' have missed that with a hurried visual or simple buzz/fast continuity check, especially if I can't pull a fuse out to read values and do a physical inspection.

----------------------
 :popcorn:    F W I W:   :popcorn:

If it was me checking that 'please help   :'( I'm sick of auctions and want to work again'  Tek 7633, I would first do a basic visual on the unit, the front panel plugin connectors and lube them,
then do a turn on, turn up the Intensity, then start working ALL those buttons and knobs at random and in multiples, and see if anything appears briefly on the screen.

Working the lot BEFORE applying power first is recommended, especially the power switch and it's banged up dials etc, and then with power applied.

Better still, have a mounted video camera or phone running to see on replay what buttons and knob combo caused a brief flicker, trace, spot or no show etc

If no go, try removing and repositioning plugins, in any basic combo possible so the unit will function, till something appears or not.


If still no life, roll up the shirt sleeves and give the unit a peaved 'Clint squint'   >:(

Warm the entire unit up with a portable fan heater and / or use a hairdryer for tight spots, especially if in a cold location and try ALL the above again.


No good? Tip the unit on it's side and upside down (carefully) warm/heat up and try again in those positions.   


FYI to gigglers  :-DD  I fixed a few same vintage 'for parts or not working' 5000 and 4xx series Teks and Phillips exactly this way years ago, and after lubing up any offender dry sticky switches, knobs and connectors, and elbow grease, they worked perfectly and within spec   ..without even turning on the multimeter and untangling the leads.
 
If anything, the time spent/wasted? above (one hour at most) will at least confirm that the unit has issues that need thorough service manual based investigative diagnosis, which as you guessed by now, I prefer to AVOID like the plague if I can, lol   

and if you can't fix it or afford repairs, the next swap meet or Ebay will gladly sort it out for you, and get that valuable bench real estate  vacant again    8)

finom1:
David,
Bill is having trouble reading his copy of the manual. This is what he just wrote me:
"I NEED a service manual I can read, I can't even read the the schematic part numbers and I can't find the HV board in the PDF.
I can NOT find schematic 7,  I can NOT find schematic 8, I hate this PDF, I have 4 of them and they are all no good, they are so bad I can't even read the parts numbers, voltages, etc..
Where is Q1195 on the HV board?
Where is C1198 on the Z-AXIS board?
What I need is for someone to take a clear photo of these parts OR a Tektronix 7633 service manual from Teltronix in PAPER form..
If I can't get a manual that I can't read I will give up."

Any ideas?

Thank you for helping!!!

finom1:

--- Quote from: Electro Detective on May 03, 2017, 02:06:44 am ---I learn something every time I watch an Old64goat video, be it his tech tips or flap.  :-+

He checked the heat/age failed glue ends 0.15 amp glass fuse with a meter and got 20 ohms reading = not good

I 'may' have missed that with a hurried visual or simple buzz/fast continuity check, especially if I can't pull a fuse out to read values and do a physical inspection.

----------------------
 :popcorn:    F W I W:   :popcorn:

If it was me checking that 'please help   :'( I'm sick of auctions and want to work again'  Tek 7633, I would first do a basic visual on the unit, the front panel plugin connectors and lube them,
then do a turn on, turn up the Intensity, then start working ALL those buttons and knobs at random and in multiples, and see if anything appears briefly on the screen.

Working the lot BEFORE applying power first is recommended, especially the power switch and it's banged up dials etc, and then with power applied.

Better still, have a mounted video camera or phone running to see on replay what buttons and knob combo caused a brief flicker, trace, spot or no show etc

If no go, try removing and repositioning plugins, in any basic combo possible so the unit will function, till something appears or not.


If still no life, roll up the shirt sleeves and give the unit a peaved 'Clint squint'   >:(

Warm the entire unit up with a portable fan heater and / or use a hairdryer for tight spots, especially if in a cold location and try ALL the above again.


No good? Tip the unit on it's side and upside down (carefully) warm/heat up and try again in those positions.   


FYI to gigglers  :-DD  I fixed a few same vintage 'for parts or not working' 5000 and 4xx series Teks and Phillips exactly this way years ago, and after lubing up any offender dry sticky switches, knobs and connectors, and elbow grease, they worked perfectly and within spec   ..without even turning on the multimeter and untangling the leads.
 
If anything, the time spent/wasted? above (one hour at most) will at least confirm that the unit has issues that need thorough service manual based investigative diagnosis, which as you guessed by now, I prefer to AVOID like the plague if I can, lol   

and if you can't fix it or afford repairs, the next swap meet or Ebay will gladly sort it out for you, and get that valuable bench real estate  vacant again    8)

--- End quote ---

Thank you for all that detailed help!!!

finom1:

--- Quote from: David Hess on May 03, 2017, 12:59:06 am ---
--- Quote from: finom1 on May 03, 2017, 12:37:04 am ---Can someone please provide screen shots or pdf scans of what the old64goat is asking for?
--- End quote ---

The link casinada gave is the scan I use for the 7633 and has all of the schematics toward the back.  They are even in color; Tektronix liked to use blue ink.

http://exodus.poly.edu/~kurt/manuals/manuals/Tektronix/TEK%207633%20%20Service.pdf


--- Quote ---"Where is schematic 7?
--- End quote ---

PDF page 296.


--- Quote ---I can't find schematic 8, ALL fuses test good.
--- End quote ---

PDF page 300.


--- Quote ---What may help is a print out of all the schematics & voltage test points for this no HV problem.
--- End quote ---

I usually end up printing out selected schematics on 11x17 paper when working on a problem like this.

--- End quote ---

Thank you David for telling him what pages to print!!!

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